Door bolt



Jan. 24, 1956 A. KIHN ET AL DOOR BOLT Filed Sept. 4, 1955 mm. nmm mww K v I 0 Z 0 2w V. B i 0 4 2 m F United States Patent DOOR BOLT Albert Kihn and Oscar Swanson, Milk River, Alberta, Canada Application September 4, 1953, Serial'No. 378,518

1 Claim. (Cl. 292-67) This invention relates to a door bolt and more specifically provides a door bolt generally known as a panic type door bolt which is used on doors of buildings where large numbers of people congregate.

An object of this invention is to provide a door bolt I which can be easily unlatched from the inside of a building merely by the pressure applied to the releasing plate by a person or persons leaning thereagainst.

A further object of this invention is to provide a door bolt that is simple in construction, inexpensive to manufacture, easy to install, requires minimum attention, and is extremely efiicient in use and service.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a perspective view of the door bolt of this invention showing the device attached to a door in an operative position;

Figure 2 is a top plan view of the door bolt of this invention showing the pivot means and the return spring;

Figure 3 is a perspective view of the latching bolt, and

Figure 4 is a transverse, side section taken substantially along section line 4-4 of Figure 2 showing the relationship of the pivot link to the latching bolts.

Referring now more specifically to the drawings it will be seen that the numeral generally designates a door hingedly connected to a door frame 12 and having a door bolt 14 for holding the door 10 in closed position.

As best seen in Figures 1 and 2 the door frame 12 is provided with a striker plate 16 adjacent one edge of the door 10 which is opposite to the hinged edge of the door. The door bolt 14 comprises a latching bolt 18 having a pointed end 20 which is continuous with one edge of the bolt 18 and opposite to the pointed end 20 on the opposite edge of the bolt 18 is a hand engaging plate 22 with the word push placed thereon in a suitable manner. Adjacent the pointed end 20 of the bolt 18 is a stop lug 24 and adjacent the push plate 22 on the same edge as the pointed end 20 is a hinge lug 26 and between these two lugs is a spring securing peg 28. Adjacent the striker plate 16 mounted on the door frame is a right angle guide plate 30 mounted on the inside of the door 10. The guide plate 30 has an opening 32 therein for receiving the end portion of the latching bolt 18 between the pointed end and the stop lug 24 and as best seen in Figure 2 the stop lug 24 abuts the guide plate 30 when the pointed end is in contact with the striker plate 16 thereby latching the door in closed position. The door 10 is provided with a hinge plate 34 on the inner surface thereof and the hinge plate 34 is provided with an apertured lug 36 which receives a pivot link 38 which is in the form of a closed loop member. As clearly seen in Figure 2 upon pressure on the push plate 22 the latching bolt 18 will pivot about the double hinge provided by the pivot link 38 being pivoted to the pivot lug 26 on the latching bolt 18 and the hinge lug 26 on the hinge plate 34 and it will be understood that the latching bolt is moved longitudinally by the action of this pivot link 38. A coil spring 40 is secured at one end to the spring lug 28 and at its other end to the guide plate 30 and this spring 40 is in tension and automatically urges the door bolt to a latch position.

The operation of the device will be readily understood. With the door 10 in closed position and the latch 14 engaging the striker plate 16 under the tension of coil spring 40 any pressure upon push plate 22 will move the latching bolt about the pivot link 38 thereby pivoting the latching bolt 18 about the double pivot axes formed by the pivot link 38 being hinged to the hinge lug 36 and the pivot lug 26 thereby retracting the latching bolt 18 and disengaging the pointed end 20 from the striker plate 16 which permits the door 10 to swing outwardly. Upon the release of pressure from the push plate 22 and closing of the door the pointed end 20 of the latching bolt 18 will engage the striker plate 16 in an obvious manner. The door bolt to this invention may be made of any suitable metal and it will be seen that no maintenance or upkeep is necessary.

From the foregoing, the construction and operation of the device will be readily understood and further explanation is believed to be unnecessary. However, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the appended claim.

What is claimed as new is as follows:

A door bolt for selectively retaining a door in closed position, the door being hinged to one side of a frame with the other side of the frame having a door stop and an apertured striker plate mounted on said door stop, said bolt comprising an elongated bar disposed along the inner surface of the door, an L-shaped bracket attached to the door with one leg thereof projecting perpendicularly therefrom in general parallel relation to the striker plate, said one leg of the bracket having an aperture therein slidably receiving said bar and permitting limited pivotal movement thereof, said bar having a stop lug on the inner surface thereof for engagement with the periphery of the aperture in said one leg on the face thereof disposed remotely from the striker plate for limiting movement of the bar towards the striker plate, said bar terminating in a pointed end for engagement with the aperture in the striker plate, said pointed end being defined by a fiat inner surface and a rounded outer surface forming a cam surface for urging the bar into a retracted position when the cam surface engages the outer edge of the striker plate, a tension spring connected between the L-shaped bracket and the bar for urging the bar towards the striker plate whereby the pointed end thereof will be disposed in the apertured leg when the door is closed for locking the door, said bar having an inclined projecting pin detachably receiving one end of said spring, said pin being inclined away from said L-shaped bracket, a hinge plate mounted on the inner surface of the door in spaced relation to the L-shaped bracket, an apertured lug on said hinge plate, an inwardly projecting apertured hinge lug on said bar with the hinge lug on the bar being a greater distance from the L-shaped bracket than the apertured lug on the hinge plate, a loop shaped pivot link interconnecting the apertured lugs to permit arcuate swinging movement of the bar, said link being normally disposed in an inclined manner to permit the lugs to move into general longitudinal alignment with the link and bar gen- 3 4 erally parallel to the door and the bar retracted, a push References Cited in the file of this patent plate on the outer surface of said bar in spaced relation UNITED STATES PATENTS to the link and disposed remotely of the L-shaped bracket whereby inward movement of the push plate will cause 638761 Sargenf 1899 arouate swinging movement of the bar for retracting the 5 1 ggg fg g pomted end thereof from engagement with the stnker 2,523,559 Couture Sept. 26, 1950 plate. 

